The best alternatives to Howler for Slack are Pun Finder, Howler, and Strikingly. If these 3 options don't work for you, we've listed a few more alternatives below.
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Howler is a collaborative joke writing platform for web and iOS. Used by amateur and professional writers, comedians and performers. Creative, Fun and Inspiring.
Strikingly is a website builder that allows the user, with little or no development experience, to create mobile optimized websites “within minutes”. The company takes a mobile-first approach, allowing users to create websites that are enhanced for viewing across all devices including desktops, tablets, and smartphones.